I'm way in the closet and didn't want to spend a lot for breasts. I found the Super Mondo Inside-out Ball at a toy store that had the right feel and about the right size, C. It squishes down for a B, or I can add a small water ballon to make a D. It will streach to most any size. After wearing it for a while, it has the same temperature as the rest of your body. At about $9 each, this was not a huge investment.
http://www.sillyasstoys.com/index.as...FSavhgodNWsdKw